*ITAMP Topical Lunch Discussion* Date: Friday, October 9th Time: 12:00-1:30 pm Pizza will be served. Location: B-106 @ Center for Astrophysics (60 Garden Street) Directions: after entering the lobby of the CfA, turn right to enter the hallway of the B building. In the hallway, turn right again, and B-106 is there. *Speaker:*Chris Ticknor , Los Alamos National Lab *Title: *Scaling of fluctuations in a trapped binary condensate *Abstract: *We demonstrate that measurements of number fluctuations within finite cells provide a direct means to study susceptibility scaling in a trapped two-component Bose-Einstein condensate. This system supports a second-order phase transition between miscible (cospatial) and immiscible (symmetry-broken) states that is driven by a diverging susceptibility to magnetic fluctuations. As the transition is approached from the miscible side the magnetic susceptibility is found to depend strongly on the geometry and orientation of the observation cell. I will additionally discuss recent work on dense molecular mixtures and their application to equation of state. This work is of interest to planetary structure. -- Stefan Pabst ITAMP Postdoc Alexander von Humboldt Fellow ITAMP, Harvard-Smithsonian Center for Astrophysics 60 Garden Street Cambridge, MA 02138, USA phone: +1-617-495-7239 fax: +1-617-496-7668 email: stefan.pabst(a)cfa.harvard.edu website: www.stefanpabst.name